Andy,
I also have been looking at seats recently and I am currently in a toss up between the NRG 300 large and the Procar (Scat) Drifter large seats. The difference in price between them is about $30, but are significantly cheaper than the Corbeaus. I need the larger seats, as I have discussed in several forum threads. From my research, the NRGs are 21.5 inches wide - possibly too wide for the Goblin - and the Procars are 19.5 inches wide, which should just fit according to the forum information. The biggest difference for me is the Procar seats are almost 2 inches taller in the seatback than the NRGs, which I also require. Both the NRG and Procar seats are fiberglass buckets with a fixed back, having the similar side mounts as the Corbeau FX1 seats. The standard size NRG seats will probably be very close to a bolt in replacement for the Corbeaus, the DF seat rails will most likely work with either brand of seat - possibly with some minor mods.